TFS 2013 admin page blank

Question

After updating from TFS 2010 to TFS 2013 update 4 the web access tool isn't showing any of the Administration features. I repaired TFS 2013 without any luck.The strange thing is I can see all requests to static content throw 500 server error even though all of the scripts are there. IE throws this exception Loading Presentation/Scripts/TFS/TFS.Extensions failed, here are the modules that depend on it: Firebug shows the following when navigate to http://tfs:8080/tfs/_diagnostics/EnableScriptDebugMode?disable=False

Answer 1

Reinstalling IIS services resolved the problem

Answer 2

In my case the issue was that the account being assigned to Microsoft Team foundation server application Pool (In IIS) did not have enough permission ...

I installed the TFS as a different user -- the administrator in my case, who has full privilege on system-- and it worked (note that I'm not sure however what specific permissions are required!).